bifocal contact lens study for adults with age-related near vision loss

Conditions: Presbyopia

Summary: the primary objective of this study is to evaluate the distance, intermediate and near visual performance of clerio designed single vision and clerio designed liric modified bifocal lenses (+2.00d add) compared to commercially available single vision and multifocal lenses.

clerio vision inc. has licensed a new femtosecond based laser procedure discovered by researchers at the university of rochester known as laser induced refractive index customization (liric), which allows the alteration of the optical design of a finished soft hydrogel contact lens. clerio vision inc. scientists have developed a diffractive multifocal optical design using the liric procedure which shows an increase of the depth of focus of the contact lens when measured on an optical bench. it is hypothesized that a presbyopic patient wearing a soft contact lens of this design will experience an improvement in intermediate and near vision over that provided by their distance corrected single vision contact lenses, without significantly impacting their distance vision. the purpose of this feasibility study is the on-eye evaluation of the performance of the clerio vision designed and liric modified soft contact lenses. results from this study will guide future development of these potential products.

Eligibility criteria:
inclusion criteria: * legal age (at least 21) on the date the informed consent form (icf) is signed and have the capacity to provide voluntary informed consent * able to read, understand and provide written informed consent on the institutional review board (irb)/ethics committee (ec) approved icf and provide authorization as appropriate for local privacy regulations. * willing and able to comply with all study instructions/procedures. * best distance spherical corrected visual acuity (bdscva) in at least one eye of 20/25 (0.10 logmar). * physiologically normal anterior segments not exhibiting clinically significant biomicroscopy findings. * previous experience with contact lenses. * distance spectacle spherical correction in at least one eye within +/- 5d of the study lens power (-3.00d). * habitual spectacle addition (at 40cm) of at least +1.00d. * refractive astigmatism less than -2.75d. * most recent complete eye examination was within the last 24 months of the date of study completion. exclusion criteria: * currently participating in any drug or device clinical investigation during the period of study participation. * active anterior segment ocular disease or using any ocular medication for anterior segment disease (e.g. conjunctivitis, dry-eye disease). * current or past condition that might have caused corneal distortion or anterior surface topography abnormalities (e.g. keratoconus, map-dot fingerprint or any other corneal dystrophies, corneal disease or trauma resulting in scarring, pterygium, pellucid marginal degeneration) * previous refractive corneal surgery (e.g., laser-assisted in situ keratomileusis (lasik), photorefractive keratectomy (prk), corneal transplant, descemet's stripping endothelial keratoplasty (dsek) etc.). * considered by the investigator to not be a suitable candidate for participation.

Keywords: refractive errors myopia hyperopia astigmatism